code: def setUpClass(cls) -> None:
      ray.init(num_cpus=6)
  
imports: import unittest
  import ray
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.algorithms.dqn import DQNConfig
  from ray.rllib.algorithms.impala import ImpalaConfig
  from ray.rllib.algorithms.ppo import PPOConfig
  from ray.rllib.algorithms.sac import SACConfig
  from ray.rllib.examples.env.multi_agent import MultiAgentCartPole, MultiAgentMountainCar
  from ray.rllib.policy.policy import PolicySpec
  from ray.rllib.utils.test_utils import check_train_results, framework_iterator
  from ray.tune.registry import register_env
label_desc: Use image node_id 1 for calling the TestSupportedMultiAgentOffPolicy obj's underlying member method code with example usage: obj.setUpClass(cls) without return types